Operating mechanism for portable dump-beds.



PATENTBD 0013.3, 1907.

G- E. EVERETT. OPERATING MECHANISM FOR PORTABLE DUMP BEDS.

APPLIOATION FILED HA3. 9. 1907- 2 SHEETS-SHEET 1.

.o I I n4: NORRIS PETERS 00., wAsHmamN,-n. c.

e. E. EVERETT.

PATBNTBD OUT. 8. 1907.

OPERATING MEGHA-NISM EOE PORTABLE DUMP BEDS.

APPLICATION FILED MAE. 9. 1907.

2 SHEETS-SHEET 2.

mllllllll ll lllllll" PATENT OFFICE.

GEORGE E. EVERETT, OF CHICAGO, ILLINOIS.

OPERATING MECHANISM FOR PORTABLE DUMP-BEDS.

Specification of Letters Patent Patented Oct. 8, 1907.

Application filed March 9,1907. Serial No. 361,458.

To all whom it may concern:

Be it known that I, GEORGE E. EVERETT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Operating Mechanism for Portable Dumping-Beds, of which the following is a specification. w

The present invention comprises certain improvements on the operating mechanism of the dumping bed for wagons covered by Letters Patent of the United States No. 785160 dated March 21, 1905.

One of the objects of the invention is to automatically hold the operating mechanism in fixed position when the bed is closed to positively prevent the bed from opening accidentally and dumping its contents.

Another object of the invention is to automatically guide the pull-pawl away from the hold-pawl and into locked position.

As my invention relates entirely to the operating mechanism I do not deem it necessary to show the entire wagon and have only illustrated that portion of the wagon bed which carries the operating mechanism.

The drawings show the preferred embodiment of my invention and referring thereto Figures 1 to 5, inclusive, are sectional views illustrating the invention in several positions. Fig. 6 is a detail perspective view of the pull-pawl. Fig. 7 and Fig. 8 are detail perspective views of the guide.

Referring to the drawings in which like numerals of reference designate corresponding parts of the several figures, 1 indicates the front end of the wagon bed and 2 the inclined front of said bed, this construction being in conformity with the bed of the patent above mentioned. The shaft 3 is mounted in bearings in the bed and carries a rigid ratchet wheel 4. An operating lever V 5 is pivotally mounted at 6 on the bed and a pull-pawl in the form of a link 7 is pivotally mounted on said lever and is adapted to engage the teeth of the ratchet wheel. A gravity holdpawl 8 is pivoted at 9 on the inclined front 2 of the wagon bed and normally rests upon the toothed edge of the ratchet wheel, engaging with one of the teeth to lock said wheel against reverse movement. Projections 11 are provided on the pullpawl to engage and release the hold-pawl from the ratchet wheel.

eration.

out of engagement with the ratchet wheel until the lever 5 has been swung rearward (to the right) sufficiently to carry the pull-pawl up until the projections 11 will rest upon instead of underneath the holdpawl. I have overcome these objections to the patented construction by the device now to be described.

To automatically and positively lock the mechanism I provide a locking device 12 on the lever 5 and this locking device may be cast integral with the lover or fastened-thereto in any suitable manner. The locking device is provided with a nose 12 which is adapted to pass through the pull-pawl and bear upon the holdpawl 8 (Fig. 3). I prefer to make both the pull-pawl 7 and the hold-pawl 8 in the form of links and springs 13 attached to the front 2 of the wagon bed and to the pull-pawl, on each side of the ratchet wheel, draw the lever 5 up adjacent to the ratchet wheel and hold the locking device in place upon the hold-pawl to prevent the latter from being accidentally disengaged from the ratchet wheel. When the parts are in locked position (Fig. 3) the springs hold the locking device carried by the lever 5 in pinched or clamped position between the pull-pawl and the hold-pawl. As heretofore mentioned it has been customary in the past, when the parts are being moved to locked position, to lift the pull-pawl by hand to prevent the projections 11 from lifting the holdpawl out of engagement with the ratchet wheel. To avoid this I provide the pull-pawl with a guide 14 (Figs. 7, 8) which is pivotally mounted on the upper end of the pull-pawl. This guide comprises two depending members 16 connected at the top by a cross bar 17 which fits easily between-the lugs 7 on the upper end of the pull-pawl. The cross bar 17 has a longitudinal bore 17 and the lugs 7 have bores 18 to receive the pin 19 whereby the guide is pivotally mounted on the pull-pawl. The members 16 have curved outer faces 16 which permit the members to slide freely in contact with the outer endof the hold-pawl when the parts are being moved to locked position. The members 16 are of sufficient length to overlap the projections 11 on the pullpawl and shield the latter from engagement with the hold-pawl when the parts are being moved to locked position and also for the further purpose of engaging the top of the hold-pawl to remain thereon when the parts are being moved inwardly to perform the unlocking op- The members 16 are also provided with rounded shoulders 16 on their under sides to enable the members to slide freely on the hold-pawl during the unlocking operation (Figs. 4, 5). The upper ends 16' of the members 16 are made to cover the upper ends of the lugs 7 to protect the pivot of the guide from dirt which might prevent the guide from swinging easily on the pull-pawl. The guide is preferably made of one casting but it can obviously be built up of several parts,

if desired.

The operation of the mechanism will be readily understood from the foregoing description in connection with the drawings. Fig. 1 illustrates the position of the parts after the shaft and ratchet wheel have been wound up as required to close the bed and the lever has been swung forward, the view showing the pullpawl resting against the ratchet wheel and the guide members resting on the projections 11 to shield them from engagement with the hold-pawl which is engaged with one tooth of the ratchet wheel.

As the lever is swung backward (to the right) by the springs the pullpawl is carried upward and the guide overlapping the projections 11 is interposed between said projections and the end of the hold-pawl (Fig. 2) until finally when the lever has reached its normal locked position the locking device 12 has its nose inserted in the link and resting upon the hold pawl, the projections 11 rest upon the end of the hold-pawl and the guide rests upon the upper side of the hold-pawl (Fig. 3). It will be observed that as the parts are moved to this locked position the guide prevents the projections 11 from lifting the hold-pawl out of engagement with the ratchet wheel. When the parts are in locked position the nose of the locking device is pinched or clamped as before stated between the end of the hold-pawl and the upper end of the pull-pawl and any tendency of the hold-pawl to jump out of engagement with the ratchet wheel will not exert a strain against the tension of the springs but on the contrary will tend to pinch the nose of the looking device harder between the hold-pawl and pull-pawl. Thus the lock is not of yielding character which would be afforded if the strain was on the springs but is of positive character because the nose of the locking device is wedged in between the two pawlsl This wedged position of the locking device also prevents the pull-pawl from engaging the ratchet wheel which would be liable not only to injure the ratchet teeth but also to break the lever. In unlocking the mechanism the lever is swung forward a short distance, as shown in Fig. 1, to lower the pull-pawl until the projections are beneath the end of the hold-pawl, during which operation the guide will remain resting upon the hold-pawl. Then the lever is swung rearward which raises the pull-pawl and causes the projections thereon to lift the hold-pawl out of engagement with the ratchet wheel (Fig. 5).

I have referred to the fact that the locking device is clamped or wedged, in locked position, between the forward end of the hold-pawl and the upper end of the pull-pawl but it will be observed that the locking de vice projects over and rests upon the hold-pawl, in locked position, and hence it will be impossible for the hold-pawl to become disengaged from the ratchet wheel while the parts are in this position because the lever is standing in or about an upright position and any upward movement of the pull-pawl would be exerted against the locking device to pull the pull-pawl out of its pivot.

While the locking device is particularly useful, as hereinbefore set forth, to prevent accidental opening of the bed, it will be understood that the operating mechanism may be locked at any time, whether the bed is open or closed. Thus if the operator should release the lever while he is winding up the shaft and ratchet wheel the lever will be drawn by the springs to lock the ratchet wheel.

While my invention is particularly adapted for embodiment in the dumping bed for wagons such as is illustrated in the patent hereinbeiorc referred to 1 dcsire to have it distinctly understood that I do not intend to confine the application of my invention to this particular embodiment but reserve the right to use it in connection with all dumping beds to which it may be adapted.

What I claim and desire to secure by Letters Patent is:

1. In an operating mechanism for a portable (lumping bed, the combination of a ratchet wheel, a lever, a pullpawl operated by the lever, a hold-pawl to prevent lo verse movement of the ratchet wheel, and means ,l'or locking said holdpawl.

2. In an operating mechanism for a, portable dumping bed, the combination of a ratchet wheel, a lever, a pullpawl operated by the lever, a hold-pawl to prevent reverse movement of the ratchet wheel, and means carried by the lever for locking said hold-pawl.

It. In an operating mechanism for a portable dumping bed, the combination of a ratchet wheel, a lever, a pullpawl operated by the lever, a hold-pawl to prevent reverse movement of the ratchet wheel, and a locking device on the lever for engaging and locking said hold pawl.

4-. In an operating mechanism for a portable dumping bed, the combination of a ratchet wheel, a lever, a pullpawl operated by the lever, a holdpawl to prevent re verse movement of the ratchet wheel, and means for simultaneously locking said pull and hold pawls.

5, In an operating mechanism for a portable dumping bed, the combination of a ratchet wheel, a lever, a pullpawl operated by the lever, a holdpawl to prevent re verse movement of the ratchet wheel, and means carried by the lever for simultaneously locking said pull and hold pawls.

G. In an operating mechanism for a portable dumping bed, the combination of a ratchet wheel, a lever, a pull pawl operated by the lever, a hold pawl to prevent reverse movement ot' the ratchet wheel, and a locking de vice on the lever for engaging and locking said poll and hold pawls.

7. In an operating mechanism for a portable dumping bed, the combination of a ratchet wheel, a, lever, a link pull-pawl operated by the lever, a hold'pawl to prevent reverse movement of the ratchet wheel, and a locking device on the lever arranged to enter said pnlhpawl and lock said holdpa\vl.

S. in an operating mechanism for a portable dumping bed, the combination of a ratchet wheel, a lever, a link pull-pawl operated by the lover, a link hold-pawl to prevent rcverse movement 01". the ratchet wheel, and a locking device having a nose to be pinched between said pawls to lock them.

9. In an operating mechanism for a portable dumping bed, the combination of a ratchet wheel, a lover, a pull pawl operated by the lever, a hold-pawl to prevent reverse movement oi the ratchet wheel, devices on said pullpawl to lift the hold-pawl out of engagement with the ratchet wheel, and means for preventingsaid devices from lifting the hold-pawl.

10. In an operating mechanism for a portable dumping bed, the combination of a ratchet wheel. a lover, a pullpawl operated by the lever, av hold-pawl to prevent re verse movement of the ratchet wheel, devices on said pullpawl to lift the hold-pawl out of engagement with the ratchet wheel, and a guide pivotally mounted on the pullpawl to prevent said devices from lifting the hold-pawl.

11. In an operating mechanism for a portable dumping bed, the combination oi a ratchet wheel, a lever, a pullpawl operated by the lover, a hold-pawl to prevent re verse movement of the ratchet wheel, devices on said pullpawl to lift the hold-pawl out of engagement with the ratchet wheel, and a guide pivotally mounted on the pullratchet wheel, and a guide pivotally mounted on the pull- I pawl and comprising members arranged to overlap and shield said devices and prevent them from lifting the hold pawl, said members having curved outer faces and rounded shoulders on their under sides.

Witnesses WM. 0. BELT,

M. A. KIDDIE.

GEORGE E EVERETT. 

